feat: Adds new admin feature preview setting management (#33212)

.changeset/quick-rings-wave.md

.../NavBarSettingsToolbar/UserMenu/hooks/useAccountItems.tsx

apps/meteor/client/hooks/useFeaturePreviewEnableQuery.ts

apps/meteor/client/sidebar/header/hooks/useAccountItems.tsx

...iews/account/featurePreview/AccountFeaturePreviewPage.tsx

apps/meteor/client/views/account/sidebarItems.tsx

...nt/views/admin/featurePreview/AdminFeaturePreviewPage.tsx

...t/views/admin/featurePreview/AdminFeaturePreviewRoute.tsx

apps/meteor/client/views/admin/routes.tsx

apps/meteor/client/views/admin/sidebarItems.ts

...teor/public/images/featurePreview/enhanced-navigation.png

...public/images/featurePreview/resizable-contextual-bar.png

apps/meteor/public/images/featurePreview/timestamp.png

apps/meteor/server/settings/accounts.ts

apps/meteor/tests/end-to-end/api/miscellaneous.ts

packages/i18n/src/locales/en.i18n.json

packages/i18n/src/locales/hi-IN.i18n.json

...ent/src/components/FeaturePreview/FeaturePreviewBadge.tsx

packages/ui-client/src/components/FeaturePreview/index.ts

packages/ui-client/src/components/index.ts